Translating mechanism



March 29,1938. R D, SALMON 2,112,308

TRANSLATING MECHANISM 7 Filed July 27, 1955 Patented Mar. 29, 1938PATENT OFFiCE 2,112,308 TRAN SLATING MECHANISM Reginald Dennis Salmon,

signer to Creed and don, England Application July 27,

In Great Britain 2 Claims.

This invention relates to translating mechanism for printing, recording,registering and like apparatus and more particularly to mechanism forselecting individual characters from a bank of characters as a result ofthe movements of a number of members each moved according to an elementof the code representing the character.

Devices of this kind are known in which the resultant motion of thecharacter selecting mechanism is the aggregate of the motion caused byall the members, and in particular it is known to use a series of cordspassing over pulleys, in such a way that the movement of each cord istransmitted in diiferent ratio to a typewheel. In this arrangement,however, each cord was movedby a separate magnet.

It is an object of the invention to provide means whereby the motion ofeach member shall be imparted in a positive and effective manner, andwhereby the character selecting mechanism may be moved the requiredamount without undue magnification of movement, and in such a way thatthe moving parts are accelerated and brought to rest with a minimum ofshock, so that the machine shall be as silent as possible in operation.

It is another object of the invention to provide a practical form ofaggregate motion device, using the movement of belts passing overpulleys, that shall be compact and adapted to modern requirements inteleprinters and the like.

According to one feature of the invention I provide translatingmechanism of the kind referred to in which the movement of a characterselecting mechanism is the aggregate of a series of separate movementstransferred from the movements of a plurality of members set insuccession by the response of a single magnet to received signals bymeans of a corresponding series of belts and pulleys, each belt passingover a pulley and transferring its movement to the next belt and themovement of the last belt being transferred to the character selectingmechanism.

According to another feature of the invention I provide translatingmechanism of the kind referred to in which the ends of a plurality ofbelts passing over pulleys are attached to members, each released formovement through a given distance by power driven means in accordancewith the elements to be translated in such a manner that the movement ofa character selecting mechanism is the aggregation of the movement givento all the belts.

The invention will be better understood from Croydon, England, as-

Company Limited, Grey- 1935, Serial No. 33,545

August 23, 1934 the following description taken in conjunction with theaccompanying drawing in which Fig. 1 shows a side elevation of one unitof a translating mechanism according to the invention;

Fig. 2 is a plan view mechanism showing how and Fig. 3 shows one mannerin which the translating mechanism may be actuated.

Referring to Figs. 1 and 2, a bar l is adapted by its movement to rightor left to move a forked detent lever 22. In the translating mechanismas applied to selecting a character according to its representation on afive unit code, there will be five bars such as i, each actuating aforked detent lever such as 2. The five bars may be moved in variouscombinations by depressing a key of a keyboard. In a type printingreceiver the five bars 5 may be moved in the same manner as the fivenotched combination bars or combs in type printing mechanism in whichnotches in such bars or combs are aligned to select a type lever forstriking against the paper or for stopping a continuously rotating typewheel in printing position. Mechanism for setting such bars successivelyin accordance with the response of a single magnet to received signalsis well known.

Each detent lever cooperates with a disc 3, 3 or 3 carrying a pin i, 4'or i". The disc tends to be driven through a friction clutch from acontinuously rotating shaft but is prevented from moving by the detentlever in the position shown. When the bar I is moved to the right thedisc 3 is released so as to move through half a revolution when it isagain arrested. Subsequent movement of the bar I to the left would againrelease the disc 3 for a second half revolution.

To the pin 4 is attached one end of a belt 5 in the form of a steel tapewhich passes over a pulley 6. The other end of the steel tape isattached to a pin 1. On the same spindle as the pulley 6 is a groovedwheel it which slides in a slot in a fixed frame I2. The spindle of thegrooved wheel ill and pulley t is fixed to a frame 8 to which is alsofixed a second grooved wheel I i also sliding in the slot in the frameH2. The frame 8 is under the action of the belt 5 and a spring I3 isfixed at one end to the sliding frame 8 and at the other to the fixedframe I2. A rack 9 is fixed to the frame 8 and meshes with a gear wheelM on the spindle of which is fixed a type wheel Hi.

When the detent 2 is moved from the position of several units of thethey are interconnected,

shown the crank pin 4 rotates through half a revolution and the pulley 6and frame 8 move through half the throw of the pin 4. This movement iscommunicated to the type wheel I5, the gearing being such that the typewheel also makes half a revolution.

The belts 5' and 5" attached to crank pins 4' and 3" respectively passover pulleys 6' and 6" and are attached to pins 1' and 1" respectively.The pin l to which belt 5 is attached is mounted on the frame 8 carryingthe pulley 6'. The pin 7' to which the belt 5' is attached is mounted onthe frame 8" carrying the pulley 6".

When crank pin 4 is given half a revolution, the frame 8' moves throughthe same distance as the diameter of disc 3, and pin 1 moves throughhalf this distance. The frame 8 then moves through half the movement ofpin 7 and type wheel i5 is given a quarter revolution. Thus there is a2: 1 step down between the movement of a crank pin and the movementtransmitted to the next unit.

By placing the pins 7, 1', etc. on moveable frames carrying the pulleys,these pins may be placed at such a distance to the left in Fig. 2 that avery compact structure results and the whole mechanism is containedwithin workable limits.

In the case of the five unit code there will be five units. Three onlyhave been shown in Fig. 2 as these are suificient to show theconstruction of the apparatus. The first crank pin serves to move thetype wheel through half a revolution, the second through a quarter andso on, the last one moving it through one thirty-second, or the space ofone character.

Although a combination bar and forked detent has been shown in Fig. 1,other means of releasing the disc 3 for half a revolution may be used.One such means is illustrated in Fig. 3 which also shows another meansof driving the disc The disc 3 is provided With a hub 3 which fitsWithin a hollow bearing I? carried on a fixed frame. On the bearing I7is loosely carried a toothed wheel i8 attached to a gear wheel i3continuously driven. A pawl 2| adapted to mesh with the toothed wheel I8is pivoted on a pin 25? carried on the inner surface of the disc 3. Thepawl 2| tends to be pressed into engagement with the toothed wheel l8 bya spring 22 fixed to the disc 3. In the position of the disc 3 shown thepawl 2| is held out of engagement with the wheel it by means of a twoarmed detent lever and when the pin 4 is at the opposite end of itsdiameter by a similar detent lever 24. The two levers 23 and 24 arepivoted on pins 25 and 23 and held in engagement with pawl 2| by aspring 27. The disc 3 is held in either of its two positions by a detentlever 28 pivoted on pin 25 and held in notch 30 or notch 3| in disc 3 bya spring 29.

If disc 3 be in position shown and the horizontal portion of lever 23 bedepressed pawl 2| will be pressed into engagement with wheel I8 and thedisc 3 will rotate therewith until lever 24 disengages pawl 2| andsimultaneously lever 28 arrests disc 3 by falling into' notch 3|. Thedisc 3 will then be moved from its second position by actuation ofdetent lever 24.

The levers 23 and 24 may be selectively depressed according to thenature of the element of a character by moving an intermediate piece toleft or right above the ends of their horizontal portions and strikingthis piece down for each character. In the case of telegraph receivingapparatus of the start stop type the intermediate piece may be struckdownwards by a cam after all such pieces have been set by the elementsof a received signal.

What is claimed is:

1. Translating mechanism comprising in combination a series of members,power driven means tending to move each of said members, detent meansfor releasing each of said members for a predetermined movement only, abelt, a pulley, and a frame carrying said pulley for each member, thebelt passing over the pulley and having one end attached to the memberand the other end attached to the frame, the other end of the last beltbeing attached to a fixed point, grooved wheels fixed to each frame andadapted to move in a slot in a fixed frame, an indicating member adaptedfor movement by one pulley, means for keeping each belt under tension,and means for operating said detent means in a combination representinga character to be translated.

2. Translating mechanism comprising in combination a series of discstending to be continuously driven by common power driven means, detentmeans individual to each disc for holding said disc from rotation andwhen actuated allowing a rotation of half a revolution only, a crank pinon each disc, a metallic tape, a pulley and a frame carrying said pulleyfor each crank pin,

the metallic tape passing over the pulley and having one end attached.to the crank pinv and the other end to the frame of the next pulley, theother end of the last metallic tape being attached to a fixed point, anindicating member adapted for movement by one pulley, means for keepingeach metallic tape under tension, and means for operating said detentmeans in a combination representing a character to be translated.

REGINALD DENNIS SALMON.

